U.S. patent application number 13/666226 was filed with the patent office on 2013-12-19 for fuel additive for improved performance in fuel injected engines.
This patent application is currently assigned to Afton Chemical Corporation. The applicant listed for this patent is AFTON CHEMICAL CORPORATION. Invention is credited to Xinggao FANG, Scott D. SCHWAB.
Application Number | 20130333650 13/666226 |
Document ID | / |
Family ID | 48577591 |
Filed Date | 2013-12-19 |
United States Patent
Application |
20130333650 |
Kind Code |
A1 |
FANG; Xinggao ; et
al. |
December 19, 2013 |
FUEL ADDITIVE FOR IMPROVED PERFORMANCE IN FUEL INJECTED ENGINES
Abstract
In accordance with the disclosure, exemplary embodiments provide
a fuel additive concentrate, a method for cleaning fuel injectors,
a method for restoring power to a diesel fuel injected engine, a
fuel composition, and a method of operating a fuel injected diesel
engine. The additive concentrate includes (a) a hydrocarbyl
substituted quaternary ammonium internal salt; and (b) a reaction
product of (i) a hydrocarbyl substituted dicarboxylic acid,
anhydride, or ester and (ii) an amine compound or salt thereof of
the formula ##STR00001## wherein R is selected from hydrogen and a
hydrocarbyl group containing from about 1 to about 15 carbon atoms,
and R.sup.1 is selected from hydrogen and a hydrocarbyl group
containing from about 1 to about 20 carbon atoms. The reaction
product (b) on average has less than 2 amino-triazole groups per
molecule. A weight ratio of (a) to (b) in the additive concentrate
ranges from about 10:1 to about 1:10.
Inventors: |
FANG; Xinggao; (Midlothian,
VA) ; SCHWAB; Scott D.; (Richmond, VA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
AFTON CHEMICAL CORPORATION |
Richmond |
VA |
US |
|
|
Assignee: |
Afton Chemical Corporation
Richmond
VA
|
Family ID: |
48577591 |
Appl. No.: |
13/666226 |
Filed: |
November 1, 2012 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
13495471 |
Jun 13, 2012 |
|
|
|
13666226 |
|
|
|
|
Current U.S.
Class: |
123/1A ;
44/386 |
Current CPC
Class: |
C10L 2270/02 20130101;
C10L 1/224 20130101; C10L 2230/22 20130101; F02B 43/00 20130101;
C10L 2270/026 20130101; C10L 10/18 20130101; C10L 10/08 20130101;
C10L 2200/0476 20130101; C10L 1/221 20130101; C10L 1/2383
20130101 |
Class at
Publication: |
123/1.A ;
44/386 |
International
Class: |
C10L 1/22 20060101
C10L001/22; F02B 43/00 20060101 F02B043/00 |
Claims
1. An additive concentrate for a fuel for use in a injected fuel
engine comprising (a) a hydrocarbyl substituted quaternary ammonium
internal salt; and (b) a reaction product derived from (i) a
hydrocarbyl substituted dicarboxylic acid, anhydride, or ester and
(ii) an amine compound or salt thereof of the formula ##STR00009##
wherein R is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 15 carbon atoms,
and R.sup.1 is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 20 carbon atoms,
wherein the reaction product (b) on average has less than 2
amino-triazole groups per molecule, and wherein a weight ratio of
(a) to (b) in the additive concentrate ranges from about 10:1 to
about 1:10.
2. The additive concentrate of claim 1, wherein additive component
(a) comprises a reaction product of a hydrocarbyl substituted
compound containing at least one tertiary amino group and a halogen
substituted C.sub.2-C.sub.8 carboxylic acid, ester, amide, or salt
thereof, wherein the reaction product as made is substantially
devoid of free anion species.
3. The additive concentrate of claim 2, wherein the hydrocarbyl
substituent of the hydrocarbyl substituted quaternary ammonium
internal salt comprises a hydrocarbyl-substituted,
carbonyl-containing substituent selected from the group consisting
of acylated polyamines, fatty amide tertiary amines, fatty acid
substituted tertiary amines, and fatty ester tertiary amines.
4. The additive concentrate of claim 1, wherein the internal salt
is selected from the group consisting of (1) hydrocarbyl
substituted compounds of the formula R--NMe.sub.2CH.sub.2COO where
R is from C.sub.1 to C.sub.30; (2) fatty amide substituted internal
salts; and (3) hydrocarbyl substituted imide, amide, or ester
internal salts wherein the hydrocarbyl group has 8 to 40 carbon
atoms.
5. The additive concentrate of claim 2, wherein the internal salt
is selected from the group consisting of polyisobutenyl substituted
succinimide, succinic diester, and succinic diamide internal salts;
C.sub.8-C.sub.40 alkenyl substituted succinic internal salts; oleyl
amidopropyl dimethylamino internal salts; and oleyl dimethylamino
internal salts.
6. The additive concentrate of claim 2, wherein additive component
(a) comprises an oleyl amidopropyl dimethylamino internal salt.
7. The additive concentrate of claim 1, wherein the amine (ii) in
additive component (b) is aminoguanidine bicarbonate.
8. The additive concentrate of claim 1, wherein a molar ratio of
(i) to (ii) in additive component (b) ranges from about 1:0.25 to
about 1:1.5.
9. A diesel fuel composition comprising a major amount of a low
sulfur diesel fuel and a minor amount of the additive concentrate
of claim 1.
10. The diesel fuel composition of claim 9, wherein the amount of
additive concentrate in the fuel ranges from about 5 to about 500
ppm by weight based on a total weight of fuel.
11. The diesel fuel of claim 9, wherein the low sulfur diesel is
substantially devoid of biodiesel fuel components.
12. A method of cleaning up internal components of a fuel injector
for a diesel engine comprising operating a fuel injected diesel
engine on a fuel composition of claim 9.
13. A method of restoring power to a diesel fuel injected engine
after an engine dirty-up phase comprising combusting in the engine
a diesel fuel composition of claim 9, wherein the power restoration
is measured by the following formula: Percent Power
recovery=(DU-CU)/DU.times.100 Wherein DU is a percent power loss at
the end of a dirty-up phase without the additive, CU is the percent
power loss at the end of a clean-up phase with the fuel additive,
and said power restoration is greater than 90%.
14. The method of claim 13, wherein the power restoration is
measured as percent power recovery relative to the power before the
dirty up phase and said power restoration is greater than 100%.
15. The method of claim 13, wherein the power restoration is
measured as percent power recovery relative to the power before the
dirty up phase and said power restoration is greater than 117%.
16. The method of claim 13, wherein the power restoration is
measured as percent power recovery relative to the power before the
dirty up phase and said power restoration is about 130%.
17. A method of improving the injector performance of a fuel
injected diesel engine comprising operating the engine on a fuel
composition comprising a major amount of fuel and from about 5 to
about 500 ppm by weight based on a total weight of the fuel of a
synergistic fuel additive comprising: (a) a hydrocarbyl substituted
quaternary ammonium internal salt; and (b) a reaction product
derived from (i) a hydrocarbyl substituted dicarboxylic acid,
anhydride, or ester and (ii) an amine compound or salt thereof of
the formula ##STR00010## wherein R is selected from the group
consisting of hydrogen and a hydrocarbyl group containing from
about 1 to about 15 carbon atoms, and R.sup.1 is selected from the
group consisting of hydrogen and a hydrocarbyl group containing
from about 1 to about 20 carbon atoms, wherein the reaction product
(b) on average has less than 2 amino-triazole groups per molecule,
and wherein a weight ratio of (a) to (b) in the fuel additive
ranges from about 10:1 to about 1:10, wherein when the synergistic
additive(s) is present in the fuel, at least about 90% of the power
lost during a dirty up phase of a CEC F98-08 DW10 test conducted in
the absence of the synergistic additive(s) is recovered.
18. The method of claim 17, wherein the engine comprises a direct
fuel injected diesel engine.
19. The method of claim 17, wherein the fuel comprises an ultra-low
sulfur diesel fuel.
20. A method of operating a fuel injected diesel engine comprising
combusting in the engine a fuel composition comprising a major
amount of fuel and from about 5 to about 500 ppm by weight based on
a total weight of the fuel of a synergistic fuel additive
comprising: (a) a hydrocarbyl substituted quaternary ammonium
internal salt; and (b) a reaction product derived from (i) a
hydrocarbyl substituted dicarboxylic acid, anhydride, or ester and
(ii) an amine compound or salt thereof of the formula ##STR00011##
wherein R is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 15 carbon atoms,
and R.sup.1 is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 20 carbon atoms,
wherein the reaction product (b) on average has less than 2
amino-triazole groups per molecule, and wherein a weight ratio of
(a) to (b) in the fuel additive ranges from about 10:1 to about
1:10
21. The method of claim 20, wherein the internal salt is selected
from the group consisting of polyisobutenyl substituted
succinimide, succinic diamide, and succinic diester internal salts;
C.sub.8-C.sub.40 alkenyl substituted succinimide, succinic diamide,
and succinic diester internal salts; oleyl amidopropyl
dimethylamino internal salts; and oleyl dimethylamino internal
salts.
22. The method of claim 20, wherein the hydrocarbyl group of the
hydrocarbyl-substituted quaternary ammonium internal salt may range
from C.sub.8 to C.sub.40.
Description
RELATED APPLICATION
[0001] This application is a continuation of application Ser. No.
13/495,471, filed Jun. 13, 2012, now pending.
TECHNICAL FIELD
[0002] The disclosure is directed to fuel additives and to additive
and additive concentrates that include the additive that are useful
for improving the performance of fuel injected engines. In
particular the disclosure is directed to a synergistic fuel
additive that is effective to enhance the performance of fuel
injectors for internal combustion engines.
BACKGROUND AND SUMMARY
[0003] It has long been desired to maximize fuel economy, power and
driveability in vehicles while enhancing acceleration, reducing
emissions, and preventing hesitation. While it is known to enhance
gasoline powered engine performance by employing dispersants to
keep valves and fuel injectors clean in port fuel injection
engines, such gasoline dispersants are not necessarily effective
fuel injected diesel engines and may not be as effective in low
sulfur fuels. The reasons for this unpredictability lie in the many
differences between the fuel compositions that are suitable for
such engines.
[0004] Additionally, new engine technologies require more effective
additives to keep the engines running smoothly. Additives are
required to keep the fuel injectors clean or clean up fouled
injectors for spark and compression type engines. Engines are also
being designed to run on alternative renewable fuels. Such renewal
fuels may include fatty acid esters and other biofuels which are
known to cause deposit formation in the fuel supply systems for the
engines. Such deposits may reduce or completely bock fuel flow,
leading to undesirable engine performance.
[0005] Some additives, such as quaternary ammonium salts that have
cations and anions bonded through ionic bonding, have been used in
fuels but may have reduced solubility in the fuels and may form
deposits in the fuels under certain conditions of fuel storage or
engine operation. Conventional quaternary ammonium salts may not be
effective for use in diesel fuels containing components derived
from renewable sources. Certain quaternary ammonium salts may not
be effective for use in petroleum-based diesel fuels. Accordingly,
there continues to be a need for fuel additives that are effective
in cleaning up fuel injector or supply systems and maintaining the
fuel injectors operating at their peak efficiency.
[0006] Also, low sulfur fuels and ultra low sulfur fuels are now
common in the marketplace for internal combustion engines. A "low
sulfur" fuel means a fuel having a sulfur content of 50 ppm by
weight or less based on a total weight of the fuel. An "ultra low
sulfur" fuel means a fuel having a sulfur content of 15 ppm by
weight or less based on a total weight of the fuel. Low sulfur
fuels tend to form more deposits in engines than conventional
fuels, for example, because of the need for additional friction
modifiers and/or corrosion inhibitors in the low sulfur fuels.
[0007] In accordance with the disclosure, exemplary embodiments
provide a fuel additive concentrate for use in injected fuel
engines, a method for cleaning fuel injectors for an internal
combustion engine, a method for restoring power to a diesel fuel
injected engine, a fuel composition, a method for improving
performance of fuel injectors, and a method of operating a fuel
injected diesel engine. The additive concentrate includes (a) a
hydrocarbyl substituted quaternary ammonium internal salt; and (b)
a reaction product derived from (i) a hydrocarbyl substituted
dicarboxylic acid, anhydride, or ester and (ii) an amine compound
or salt thereof of the formula
##STR00002##
wherein R is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 15 carbon atoms,
and R.sup.1 is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 20 carbon atoms.
The reaction product (b) on average has less than 2 amino-triazole
groups per molecule. One weight ratio of (a) to (b) in the additive
concentrate ranges from about 10:1 to about 1:10.
[0008] Another embodiment of the disclosure provides a method of
improving the injector performance of a fuel injected diesel
engine. The method includes operating the engine on a fuel
composition that includes a major amount of fuel and from about 5
to about 500 ppm by weight based on a total weight of the fuel of a
synergistic fuel additive. The synergistic fuel additive includes
(a) a hydrocarbyl substituted quaternary ammonium internal salt;
and (b) a reaction product derived from (i) a hydrocarbyl
substituted dicarboxylic acid, anhydride, or ester and (ii) an
amine compound or salt thereof of the formula
##STR00003##
wherein R is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 15 carbon atoms,
and R.sup.1 is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 20 carbon atoms.
The reaction product (b) on average has less than 2 amino-triazole
groups per molecule. A weight ratio of (a) to (b) in the fuel
additive ranges from about 10:1 to about 1:10. With the synergistic
additive(s) present in the fuel, in one embodiment, at least about
90% of the power lost during a dirty up phase (when no inventive
additive(s) is present in the fuel) of a CEC F98-08 DW10 test is
recovered.
[0009] A further embodiment of the disclosure provides a method of
operating a fuel injected engine. The method includes combusting in
the engine a fuel composition containing a major amount of fuel and
from about 5 to about 500 ppm by weight based on a total weight of
the fuel of a synergistic fuel additive. The synergistic fuel
additive includes (a) a hydrocarbyl substituted quaternary ammonium
internal salt; and (b) a reaction product derived from (i) a
hydrocarbyl substituted dicarboxylic acid, anhydride, or ester and
(ii) an amine compound or salt thereof of the formula
##STR00004##
wherein R is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 15 carbon atoms,
and R.sup.1 is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 20 carbon atoms.
The reaction product (b) on average has less than 2 amino-triazole
groups per molecule. A weight ratio of (a) to (b) in the fuel
additive ranges from about 10:1 to about 1:10.
[0010] An advantage of the fuel additive described herein is that
the additive may not only reduce the amount of deposits forming on
fuel injectors, but the additive may also be effective to clean up
dirty fuel injectors sufficient to provide improved power recovery
to the engine. The combination of components (a) and (b) in a fuel
may be synergistically more effective for improving injector
performance and power recovery (power restoration) than each of the
components (a) and (b) alone in the fuel.
[0011] Additional embodiments and advantages of the disclosure will
be set forth in part in the detailed description which follows,
and/or can be learned by practice of the disclosure. It is to be
understood that both the foregoing general description and the
following detailed description are exemplary and explanatory only
and are not restrictive of the disclosure, as claimed.
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0012] Components (a) and (b) of the fuel additive may be used in a
minor amount in a major amount of fuel and may be added to the fuel
directly or added as components of an additive concentrate to the
fuel.
Component (a)
[0013] Component (a) of the fuel additive for improving the
operation of internal combustion engines may be made by a wide
variety of well known reaction techniques with amines or
polyamines. For example, such additive component (a) may be made by
reacting a tertiary amine of the formula
##STR00005##
wherein each of R.sup.1, R.sup.2, and R.sup.3 is selected from
hydrocarbyl groups containing from 1 to 200 carbon atoms, with a
halogen substituted C.sub.2-C.sub.8 carboxylic acid, ester, amide,
or salt thereof. What is generally to be avoided in the reaction is
quaternizing agents selected from the group consisting of
hydrocarbyl substituted carboxylates, carbonates,
cyclic-carbonates, phenates, epoxides, or mixtures thereof. In one
embodiment, the halogen substituted C.sub.2-C.sub.8 carboxylic
acid, ester, amide, or salt thereof may be selected from chloro-,
bromo-, fluoro-, and iodo-C.sub.2-C.sub.8 carboxylic acids, esters,
amides, and salts thereof. The salts may be alkali or alkaline
earth metal salts selected from sodium, potassium, lithium calcium,
and magnesium salts. A particularly useful halogen substituted
compound for use in the reaction is the sodium or potassium salt of
a chloroacetic acid.
[0014] As used herein, the term "hydrocarbyl group" or
"hydrocarbyl" is used in its ordinary sense, which is well-known to
those skilled in the art. Specifically, it refers to a group having
a carbon atom directly attached to the remainder of a molecule and
having a predominantly hydrocarbon character. Examples of
hydrocarbyl groups include: [0015] (1) hydrocarbon substituents,
that is, aliphatic (e.g., alkyl or alkenyl), alicyclic (e.g.,
cycloalkyl, cycloalkenyl) substituents, and aromatic-, aliphatic-,
and alicyclic-substituted aromatic substituents, as well as cyclic
substituents wherein the ring is completed through another portion
of the molecule (e.g., two substituents together form an alicyclic
radical); [0016] (2) substituted hydrocarbon substituents, that is,
substituents containing non-hydrocarbon groups which, in the
context of the description herein, do not alter the predominantly
hydrocarbon substituent (e.g., halo (especially chloro and fluoro),
hydroxy, alkoxy, mercapto, alkylmercapto, nitro, nitroso, amino,
alkylamino, and sulfoxy); [0017] (3) hetero-substituents, that is,
substituents which, while having a predominantly hydrocarbon
character, in the context of this description, contain other than
carbon in a ring or chain otherwise composed of carbon atoms.
Hetero-atoms include sulfur, oxygen, nitrogen, and encompass
substituents such as carbonyl, amido, imido, pyridyl, furyl,
thienyl, ureyl, and imidazolyl. In general, no more than two, or as
a further example, no more than one, non-hydrocarbon substituent
will be present for every ten carbon atoms in the hydrocarbyl
group; in some embodiments, there will be no non-hydrocarbon
substituent in the hydrocarbyl group.
[0018] As used herein, the term "major amount" is understood to
mean an amount greater than or equal to 50 wt. %, for example from
about 80 to about 98 wt. % relative to the total weight of the
composition. Moreover, as used herein, the term "minor amount" is
understood to mean an amount less than 50 wt. % relative to the
total weight of the composition.
[0019] As used herein the term "substantially devoid of free anion
species" means that the anions, for the most part are covalently
bound to the product such that the reaction product as made does
not contain any substantial amounts of free anions or anions that
are ionically bound to the product. In one embodiment,
"substantially devoid" means from 0 to less than about 2 wt. % of
anion species.
[0020] As used herein the term "ultra-low sulfur" means fuels
having a sulfur content of 15 ppm by weight or less.
[0021] In one embodiment, a tertiary amine including monoamines and
polyamines may be reacted with the halogen substituted acetic acid
or derivative thereof to provide component (a). Suitable tertiary
amine compounds of the formula
##STR00006##
wherein each of R.sup.1, R.sup.2, and R.sup.3 is selected from
hydrocarbyl groups containing from 1 to 200 carbon atoms may be
used. Each hydrocarbyl group R.sup.1 to R.sup.3 may independently
be linear, branched, substituted, cyclic, saturated, unsaturated,
or contain one or more hetero atoms. Suitable hydrocarbyl groups
may include, but are not limited to alkyl groups, aryl groups,
alkylaryl groups, arylalkyl groups, alkoxy groups, aryloxy groups,
amido groups, ester groups, imido groups, and the like.
Particularly suitable hydrocarbyl groups may be linear or branched
alkyl groups. Some representative examples of amine reactants which
can be reacted to yield compounds of this invention are: trimethyl
amine, triethyl amine, tri-n-propyl amine, dimethylethyl amine,
dimethyl lauryl amine, dimethyl oleyl amine, dimethyl stearyl
amine, dimethyl eicosyl amine, dimethyl octadecyl amine, N-methyl
piperidine, N,N'-dimethyl piperazine, N-methyl-N-ethyl piperazine,
N-methyl morpholine, N-ethyl morpholine, N-hydroxyethyl morpholine,
pyridine, triethanol amine, triisopropanol amine, methyl diethanol
amine, dimethyl ethanol amine, lauryl diisopropanol amine, stearyl
diethanol amine, dioleyl ethanol amine, dimethyl isobutanol amine,
methyl diisooctanol amine, dimethyl propenyl amine, dimethyl
butenyl amine, dimethyl octenyl amine, ethyl didodecenyl amine,
dibutyl eicosenyl amine, triethylene diamine, hexamethylene
tetramine, N,N,N',N'-tetramethylethylenediamine,
N,N,N',N'-tetramethylpropylenediamine,
N,N,N',N'-tetraethyl-1,3-propanediamine, methyldicyclohexyl amine,
2,6-dimethylpyridine, dimethylcylohexylamine,
C.sub.10-C.sub.30-alkyl or alkenyl-substituted
amidopropyldimethylamine, C.sub.12-C.sub.200-alkyl or
alkenyl-substituted succinic-carbonyldimethylamine, and the
like.
[0022] If the amine contains solely primary or secondary amino
groups, it is necessary to alkylate at least one of the primary or
secondary amino groups to a tertiary amino group prior to the
reaction with the halogen substituted C.sub.2-C.sub.8 carboxylic
acid, ester, amide, or salt thereof. In one embodiment, alkylation
of primary amines and secondary amines or mixtures with tertiary
amines may be exhaustively or partially alkylated to a tertiary
amine. It may be necessary to properly account for the hydrogens on
the nitrogens and provide base or acid as required (e.g.,
alkylation up to the tertiary amine requires removal
(neutralization) of the hydrogen (proton) from the product of the
alkylation). If alkylating agents, such as, alkyl halides or
dialkyl sulfates are used, the product of alkylation of a primary
or secondary amine is a protonated salt and needs a source of base
to free the amine for further reaction.
[0023] The halogen substituted C.sub.2-C.sub.8 carboxylic acid,
ester, amide, or salt thereof for use in making component (a) may
be derived from a mono-, di-, or trio- chloro- bromo-, fluoro-, or
iodo-carboxylic acid, ester, amide, or salt thereof selected from
the group consisting of halogen-substituted acetic acid, propanoic
acid, butanoic acid, isopropanoic acid, isobutanoic acid,
tert-butanoic acid, pentanoic acid, heptanoic acid, octanoic acid,
halo-methyl benzoic acid, and isomers, esters, amides, and salts
thereof. The salts of the carboxylic acids may include the alkali
or alkaline earth metal salts, or ammonium salts including, but not
limited to the Na, Li, K, Ca, Mg, triethyl ammonium and triethanol
ammonium salts of the halogen-substituted carboxylic acids. A
particularly suitable halogen substituted carboxylic acid, or salt
thereof may be selected from chloroacetic acid and sodium or
potassium chloroacetate. The amount of halogen substituted
C.sub.2-C.sub.8 carboxylic acid, ester, amide, or salt thereof
relative to the amount of tertiary amine reactant may range from a
molar ratio of about 1:0.1 to about 0.1:1.0.
[0024] The internal salts made according to the foregoing procedure
may include, but are not limited to (1) hydrocarbyl substituted
compounds of the formula R--NMe.sub.2CH.sub.2COO where R is from
C.sub.1 to C.sub.30; (2) fatty amide substituted internal salts;
and (3) hydrocarbyl substituted imide, amide, or ester internal
salts wherein the hydrocarbyl group has 8 to 40 carbon atoms.
Particularly suitable internal salts may be selected from the group
consisting of polyisobutenyl substituted succinimide, succinic
diamide, and succinic diester internal salts; C.sub.8-C.sub.40
alkenyl substituted succinimide, succinic diamide, and succinic
diester internal salts; oleyl amidopropyl dimethylamino internal
salts; and oleyl dimethylamino internal salts.
Component (b)
[0025] Component (b) of the additive composition described herein
may be a reaction product derived from (i) a hydrocarbyl
substituted dicarboxylic acid, anhydride, or ester and (ii) an
amine compound or salt thereof of the formula
##STR00007##
wherein R is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 15 carbon atoms,
and R.sup.1 is selected from the group consisting of hydrogen and a
hydrocarbyl group containing from about 1 to about 20 carbon atoms,
wherein the reaction product (b) on average has less than 2
amino-triazole groups per molecule.
[0026] The hydrocarbyl substituted dicarboxylic acid, anhydride, or
ester may be a hydrocarbyl carbonyl compound of the formula
##STR00008##
wherein R.sup.2 is a hydrocarbyl group having a number average
molecular weight ranging from about 200 to about 3000 wherein the
reaction product of component (b) contains less than one equivalent
of amino triazole group per molecule of reaction product.
[0027] In some aspects, the hydrocarbyl carbonyl compound may be a
polyalkylene succinic anhydride reactant wherein R.sup.2 is a
hydrocarbyl moiety, such as for example, a polyalkenyl radical
having a number average molecular weight of from about 100 to about
5,000. For example, the number average molecular weight of R.sup.2
may range from about 200 to about 3,000, as measured by GPC. Unless
indicated otherwise, molecular weights in the present specification
are number average molecular weights.
[0028] The R.sup.2 hydrocarbyl moiety may comprise one or more
polymer units chosen from linear or branched alkenyl units. In some
aspects, the alkenyl units may have from about 2 to about 10 carbon
atoms. For example, the polyalkenyl radical may comprise one or
more linear or branched polymer units chosen from ethylene
radicals, propylene radicals, butylene radicals, pentene radicals,
hexene radicals, octene radicals and decene radicals. In some
aspects, the R.sup.2 polyalkenyl radical may be in the form of, for
example, a homopolymer, copolymer or terpolymer. In one aspect, the
polyalkenyl radical is isobutylene. For example, the polyalkenyl
radical may be a homopolymer of polyisobutylene comprising from
about 10 to about 60 isobutylene groups, such as from about 20 to
about 30 isobutylene groups. The polyalkenyl compounds used to form
the R.sup.2 polyalkenyl radicals may be formed by any suitable
methods, such as by conventional catalytic oligomerization of
alkenes.
[0029] In an additional aspect, the hydrocarbyl moiety R.sup.2 may
be derived from a linear alpha olefin or an acid-isomerized alpha
olefin made by the oligomerization of ethylene by methods well
known in the art. These hydrocarbyl moieties can range from about 8
carbon atoms to over 40 carbon atoms. For example, alkenyl moieties
of this type may be derived from a linear C.sub.18 or a mixture of
C.sub.20-24 alpha olefins or from acid-isomerized C.sub.16 alpha
olefins.
[0030] In some aspects, high reactivity polyisobutenes having
relatively high proportions of polymer molecules with a terminal
vinylidene group may be used to form the R.sup.2 group. In one
example, at least about 60%, such as about 70% to about 90%, of the
polyisobutenes comprise terminal olefinic double bonds. There is a
general trend in the industry to convert to high reactivity
polyisobutenes, and well known high reactivity polyisobutenes are
disclosed, for example, in U.S. Pat. No. 4,152,499, the disclosure
of which is herein incorporated by reference in its entirety.
[0031] Specific examples of hydrocarbyl carbonyl compounds include
such compounds as dodecenylsuccinic anhydrides, C.sub.16-18 alkenyl
succinic anhydride, and polyisobutenyl succinic anhydride (PIBSA).
In some embodiments, the PIBSA may have a polyisobutylene portion
with a vinylidene content ranging from about 4% to greater than
about 90%. In some embodiments, the molar ratio of the number of
carbonyl groups to the number of hydrocarbyl moieties in the
hydrocarbyl carbonyl compound may range from about 0.5:1 to about
5:1.
[0032] In some aspects, approximately one mole of maleic anhydride
may be reacted per mole of polyalkylene, such that the resulting
polyalkenyl succinic anhydride has about 0.8 to about 1 succinic
anhydride group per polyalkylene substituent. In other aspects, the
molar ratio of succinic anhydride groups to alkylene groups may
range from about 0.5 to about 3.5, such as from about 1 to about
1.1.
[0033] The hydrocarbyl carbonyl compounds may be made using any
suitable method. Methods for forming hydrocarbyl carbonyl compounds
are well known in the art. One example of a known method for
forming a hydrocarbyl carbonyl compound comprises blending a
polyolefin and maleic anhydride. The polyolefin and maleic
anhydride reactants are heated to temperatures of, for example,
about 150.degree. C. to about 250.degree. C., optionally, with the
use of a catalyst, such as chlorine or peroxide. Another exemplary
method of making the polyalkylene succinic anhydrides is described
in U.S. Pat. No. 4,234,435, which is incorporated herein by
reference in its entirety.
[0034] Suitable amine compounds form making component (b) may be
chosen from guanidines and aminoguanidines or salts thereof.
Accordingly, the amine compound may be chosen from the inorganic
salts of guanidines, such as the halide, carbonate, nitrate,
phosphate, and orthophosphate salts of guanidines. The term
"guanidines" refers to guanidine and guanidine derivatives, such as
aminoguanidine. In one embodiment, the guanidine compound for the
preparation of the additive is aminoguanidine bicarbonate.
Aminoguanidine bicarbonates are readily obtainable from commercial
sources, or can be prepared in a well-known manner.
[0035] The hydrocarbyl carbonyl and amine compounds described above
may be mixed together under suitable conditions to provide
component (b) of the present disclosure. In one aspect of the
present disclosure, the reactant compounds for component (b) may be
mixed together in a mole ratio of hydrocarbyl carbonyl compound to
amine ranging from about 1:0.5 to about 1:1.5. For example, the
mole ratio of the reactants may range from about 1:0.5 to about
1:0.95.
[0036] Suitable reaction temperatures may range from about
130.degree. C. to less than about 200.degree. C. at atmospheric
pressure. For example, reaction temperatures may range from about
140.degree. C. to about 160.degree. C. Any suitable reaction
pressures may be used, such as, including subatmospheric pressures
or superatmospheric pressures. However, the range of temperatures
may be different from those listed where the reaction is carried
out at other than atmospheric pressure. The reaction may be carried
out for a period of time within the range of about 1 hour to about
8 hours, preferably, within the range of about 2 hours to about 6
hours.
[0037] The component (b) reaction product may be characterized by
an FTIR spectrum having a peak intensity in a region of from about
1630 cm.sup.-1 to about 1645 cm.sup.-1 that ranges from about 5 to
about 45% of peak intensities of other peak in a region of from
about 1500 cm.sup.-1 to about 1800 cm.sup.-1. For example,
component (b) may have a peak intensity in the region of from 1630
cm.sup.-1 to about 1645 cm.sup.-1 that ranges from about 5 to about
45% of peak intensities of other peaks in a region of from about
1500 cm.sup.-1 to about 1800 cm.sup.-1. In other embodiments,
component (b) may have a characteristic peak intensity in the range
of from 1630 cm.sup.-1 to about 1645 cm.sup.-1 that is no more than
30%, for example no more than 25%, and typically no more than 10%
of the intensity of other peaks in the range of from about 1500
cm.sup.-1 to about 1800 cm.sup.-1.
[0038] The amount of components (a) and (b) in the fuel or fuel
additive concentrate may range from a weight ratio of 10:1 to 1:10,
for example from about 5:1 to about 1:5 by weight. Other useful
weight ratios of (a) to (b) in a fuel may range from 2:1 to 1:4 and
from 1:1 to 1:2.
[0039] In some aspects of the present application, the components
(a) and (b) of the additive compositions of this disclosure may be
used in combination with a fuel soluble carrier. Such carriers may
be of various types, such as liquids or solids, e.g., waxes.
Examples of liquid carriers include, but are not limited to,
mineral oil and oxygenates, such as liquid polyalkoxylated ethers
(also known as polyalkylene glycols or polyalkylene ethers), liquid
polyalkoxylated phenols, liquid polyalkoxylated esters, liquid
polyalkoxylated amines, and mixtures thereof. Examples of the
oxygenate carriers may be found in U.S. Pat. No. 5,752,989, issued
May 19, 1998 to Henly et. al., the description of which carriers is
herein incorporated by reference in its entirety. Additional
examples of oxygenate carriers include alkyl-substituted aryl
polyalkoxylates described in U.S. Patent Publication No.
2003/0131527, published Jul. 17, 2003 to Colucci et. al., the
description of which is herein incorporated by reference in its
entirety.
[0040] In other aspects, the additive compositions of (a) and (b)
may not contain a carrier. For example, some additive compositions
of the present disclosure may not contain mineral oil or
oxygenates, such as those oxygenates described above.
[0041] One or more additional optional compounds may be present in
the fuel compositions of the disclosed embodiments. For example,
the fuels may contain conventional quantities of cetane improvers,
corrosion inhibitors, cold flow improvers (CFPP additive), pour
point depressants, solvents, demulsifiers, lubricity additives,
friction modifiers, amine stabilizers, combustion improvers,
dispersants, antioxidants, heat stabilizers, conductivity
improvers, metal deactivators, marker dyes, organic nitrate
ignition accelerators, cyclomatic manganese tricarbonyl compounds,
and the like. In some aspects, the compositions described herein
may contain about 10 weight percent or less, or in other aspects,
about 5 weight percent or less, based on the total weight of the
additive concentrate, of one or more of the above additives.
Similarly, the fuels may contain suitable amounts of conventional
fuel blending components such as methanol, ethanol, dialkyl ethers,
and the like.
[0042] In some aspects of the disclosed embodiments, organic
nitrate ignition accelerators that include aliphatic or
cycloaliphatic nitrates in which the aliphatic or cycloaliphatic
group is saturated, and that contain up to about 12 carbons may be
used. Examples of organic nitrate ignition accelerators that may be
used are methyl nitrate, ethyl nitrate, propyl nitrate, isopropyl
nitrate, allyl nitrate, butyl nitrate, isobutyl nitrate, sec-butyl
nitrate, tert-butyl nitrate, amyl nitrate, isoamyl nitrate, 2-amyl
nitrate, 3-amyl nitrate, hexyl nitrate, heptyl nitrate, 2-heptyl
nitrate, octyl nitrate, isooctyl nitrate, 2-ethylhexyl nitrate,
nonyl nitrate, decyl nitrate, undecyl nitrate, dodecyl nitrate,
cyclopentyl nitrate, cyclohexyl nitrate, methylcyclohexyl nitrate,
cyclododecyl nitrate, 2-ethoxyethyl nitrate,
2-(2-ethoxyethoxy)ethyl nitrate, tetrahydrofuranyl nitrate, and the
like. Mixtures of such materials may also be used.
[0043] Examples of suitable optional metal deactivators useful in
the compositions of the present application are disclosed in U.S.
Pat. No. 4,482,357 issued Nov. 13, 1984, the disclosure of which is
herein incorporated by reference in its entirety. Such metal
deactivators include, for example, salicylidene-o-aminophenol,
disalicylidene ethylenediamine, disalicylidene propylenediamine,
and N,N'-disalicylidene-1,2-diaminopropane.
[0044] Suitable optional cyclomatic manganese tricarbonyl compounds
which may be employed in the compositions of the present
application include, for example, cyclopentadienyl manganese
tricarbonyl, methylcyclopentadienyl manganese tricarbonyl, indenyl
manganese tricarbonyl, and ethylcyclopentadienyl manganese
tricarbonyl. Yet other examples of suitable cyclomatic manganese
tricarbonyl compounds are disclosed in U.S. Pat. No. 5,575,823,
issued Nov. 19, 1996, and U.S. Pat. No. 3,015,668, issued Jan. 2,
1962, both of which disclosures are herein incorporated by
reference in their entirety.
[0045] Other commercially available detergents may be used in
combination with additive components (a) and (b) as described
herein. Such detergents include but are not limited to
succinimides, Mannich base detergents, quaternary ammonium
detergents, bis-aminotriazole detergents as generally described in
U.S. patent application Ser. No. 13/450,638.
[0046] When formulating the fuel compositions of this application,
the additive composition of (a) and (b) may be employed in amounts
sufficient to reduce or inhibit deposit formation in a fuel system
or combustion chamber of an engine and/or crankcase. In some
aspects, the fuels may contain minor amounts of the above described
additive composition that controls or reduces the formation of
engine deposits, for example injector deposits in diesel engines.
For example, the diesel fuels of this application may contain, on
an active ingredient basis, a total amount of the additive
composition of components (a) and (b) in the range of about 5 mg to
about 500 mg of additive composition per Kg of fuel, such as in the
range of about 10 mg to about 150 mg of per Kg of fuel or in the
range of from about 30 mg to about 100 mg of the additive
composition per Kg of fuel. In aspects, where a carrier is
employed, the fuel compositions may contain, on an active
ingredients basis, an amount of the carrier in the range of about 1
mg to about 100 mg of carrier per Kg of fuel, such as about 5 mg to
about 50 mg of carrier per Kg of fuel. The active ingredient basis
excludes the weight of (i) unreacted components associated with and
remaining in additive composition, and (ii) solvent(s), if any,
used in the manufacture of the additive composition either during
or after its formation but before addition of a carrier, if a
carrier is employed.
[0047] The additive compositions of the present application,
including components (a) and (b) described above, and optional
additives used in formulating the fuels of this invention may be
blended into the base diesel fuel individually or in various
sub-combinations. In some embodiments, the additive components of
the present application may be blended into the diesel fuel
concurrently using an additive concentrate, as this takes advantage
of the mutual compatibility and convenience afforded by the
combination of ingredients when in the form of an additive
concentrate. Also, use of a concentrate may reduce blending time
and lessen the possibility of blending errors.
[0048] The fuels of the present application may be applicable to
the operation of diesel engine. The engine include both stationary
engines (e.g., engines used in electrical power generation
installations, in pumping stations, etc.) and ambulatory engines
(e.g., engines used as prime movers in automobiles, trucks,
road-grading equipment, military vehicles, etc.). For example, the
fuels may include any and all middle distillate fuels, diesel
fuels, biorenewable fuels, biodiesel fuel, gas-to-liquid (GTL)
fuels, jet fuel, alcohols, ethers, kerosene, low sulfur fuels,
synthetic fuels, such as Fischer-Tropsch fuels, liquid petroleum
gas, bunker oils, coal to liquid (CTL) fuels, biomass to liquid
(BTL) fuels, high asphaltene fuels, fuels derived from coal
(natural, cleaned, and petcoke), genetically engineered biofuels
and crops and extracts therefrom, and natural gas. "Biorenewable
fuels" as used herein is understood to mean any fuel which is
derived from resources other than petroleum. Such resources
include, but are not limited to, corn, maize, soybeans and other
crops; grasses, such as switchgrass, miscanthus, and hybrid
grasses; algae, seaweed, vegetable oils; natural fats; and mixtures
thereof. In an aspect, the biorenewable fuel can comprise
monohydroxy alcohols, such as those comprising from 1 to about 5
carbon atoms. Non-limiting examples of suitable monohydroxy
alcohols include methanol, ethanol, propanol, n-butanol,
isobutanol, t-butyl alcohol, amyl alcohol, and isoamyl alcohol.
[0049] Diesel fuels that may be used include low sulfur diesel
fuels and ultra low sulfur diesel fuels. A "low sulfur" diesel fuel
means a fuel having a sulfur content of 50 ppm by weight or less
based on a total weight of the fuel. An "ultra low sulfur" diesel
fuel (ULSD) means a fuel having a sulfur content of 15 ppm by
weight or less based on a total weight of the fuel. In another
embodiment, the diesel fuels are substantially devoid of biodiesel
fuel components.
[0050] Accordingly, aspects of the present application are directed
to methods for reducing the amount of injector deposits of engines
having at least one combustion chamber and one or more direct fuel
injectors in fluid connection with the combustion chamber. In
another aspect, the additive containing components (a) and (b)
described herein may be combined with succinimide detergents,
derivatives of succinimide detergents, and/or quaternary ammonium
salts having one or more polyolefin groups; such as quaternary
ammonium salts of polymonoolefins, polyhydrocarbyl succinimides;
polyhydrocarbyl Mannich compounds: polyhydrocarbyl amides and
esters. The foregoing quaternary ammonium salts may be disclosed
for example in U.S. Pat. Nos. 3,468,640; 3,778,371; 4,056,531;
4171,959; 4,253,980; 4,326,973; 4,338,206; 4,787,916; 5,254,138:
7,906,470; 7,947,093; 7,951,211; U.S. Publication No. 2008/0113890;
European Patent application Nos. EP 0293192; EP 2033945; and PCT
Application No. WO 2001/110860.
[0051] In some aspects, the methods comprise injecting a
hydrocarbon-based compression ignition fuel comprising the additive
composition of the present disclosure through the injectors of the
diesel engine into the combustion chamber, and igniting the
compression ignition fuel. In some aspects, the method may also
comprise mixing into the diesel fuel at least one of the optional
additional ingredients described above.
[0052] The fuel compositions described herein are suitable for both
direct and indirect injected diesel engines. The direct injected
diesel engines include high pressure common rail direct injected
engines.
[0053] In one embodiment, the diesel fuels of the present
application may be essentially free, such as devoid, of
conventional succinimide dispersant compounds. In another
embodiment, the fuel is essentially free of quaternary ammonium
salts of a hydrocarbyl succinimide or quaternary ammonium salts of
a hydrocarbyl Mannich. The term "essentially free" is defined for
purposes of this application to be concentrations having
substantially no measurable effect on injector cleanliness or
deposit formation.
EXAMPLES
[0054] The following examples are illustrative of exemplary
embodiments of the disclosure. In these examples as well as
elsewhere in this application, all parts and percentages are by
weight unless otherwise indicated. It is intended that these
examples are being presented for the purpose of illustration only
and are not intended to limit the scope of the invention disclosed
herein.
Comparative Example 1
[0055] A 950 molecular weight polybutenyl succinic anhydride (295
grams) was mixed with 86 grams (2 equivalents) aminoguanidine
bicarbonate (AGBC) and 416 grams of aromatic solvent 150. The
mixture was heated under vacuum to 165.degree. C. and held at that
temperature for about 4 hours, removing water and carbon dioxide.
The resulting mixture was filtered. An FTIR spectrum of the product
shows a peak at 1636 cm.sup.-1 that dominates the peaks in a region
from 1500 cm.sup.-1 to 1800 cm.sup.-1.
Component (a) Example 1
[0056] A mixture of oleyl amidopropyl dimethylamine (OD, 366 grams)
and sodium chloroacetate (SCA, 113 grams) was heated in a mixture
of isopropanol (125 mL) and water (51 grams) at 80.degree. C. for
5.5 hours. Isopropanol (600 mL) and 2-ethylhexanol (125 grams) were
added and the mixture was concentrated by heating to remove water.
The resultant mixture was filtered through CELITE 512 filter medium
to give product as a yellow oil.
Component (a) Example 2
[0057] The reaction product was made similar to Component (a)
Example 1 with the exception that OD was replaced with oleyl
dimethylamine. The reaction product was mixed with an aromatic
solvent and 2-ethylhexanol to provide a yellow liquid.
Component (b) Example 3
[0058] A flask was charged with 950 molecular weight polybutenyl
succinic anhydride (553 grams), aromatic solvent 150 (210 grams),
aminoguanidine bicarbonate (AGBC) (79.5 grams, 1 equivalent), and
toluene (145 grams). The reaction mixture was heated up to
145.degree. C. and held for about 2 hours. No more water was
removed through azeotrope distillation. A sample was removed and
diluted with about an equal weight of heptane. The resulting
mixture was filtered through CELITE 512 filter medium and
concentrated by a rotary evaporator to give desired product as a
brownish oil. An FTIR spectrum of the product showed peaks at 1724,
1689, 1637, 1588 cm.sup.-1 with the peak at 1637 cm.sup.-1 being
the smallest.
Component (b) Example 4
[0059] The reaction product was made similar to Component (b)
Example 3 with the exception that 36 grams of aminoguanidine
bicarbonate (AGBC) was used.
[0060] In the following example, an injector deposit test was
performed on a diesel engine using an industry standard diesel
engine fuel injector test, CEC F-98-08 (DW10) as described
below.
Diesel Engine Test Protocol
[0061] A DW10 test that was developed by Coordinating European
Council (CEC) was used to demonstrate the propensity of fuels to
provoke fuel injector fouling and was also used to demonstrate the
ability of certain fuel additives to prevent or control these
deposits. Additive evaluations used the protocol of CEC F-98-08 for
direct injection, common rail diesel engine nozzle coking tests. An
engine dynamometer test stand was used for the installation of the
Peugeot DW10 diesel engine for running the injector coking tests.
The engine was a 2.0 liter engine having four cylinders. Each
combustion chamber had four valves and the fuel injectors were DI
piezo injectors have a Euro V classification.
[0062] The core protocol procedure consisted of running the engine
through a cycle for 8-hours and allowing the engine to soak (engine
off) for a prescribed amount of time. The foregoing sequence was
repeated four times. At the end of each hour, a power measurement
was taken of the engine while the engine was operating at rated
conditions. The injector fouling propensity of the fuel was
characterized by a difference in observed rated power between the
beginning and the end of the test cycle.
[0063] Test preparation involved flushing the previous test's fuel
from the engine prior to removing the injectors. The test injectors
were inspected, cleaned, and reinstalled in the engine. If new
injectors were selected, the new injectors were put through a
16-hour break-in cycle. Next, the engine was started using the
desired test cycle program. Once the engine was warmed up, power
was measured at 4000 RPM and full load to check for full power
restoration after cleaning the injectors. If the power measurements
were within specification, the test cycle was initiated. The
following Table 1 provides a representation of the DW10 coking
cycle that was used to evaluate the fuel additives according to the
disclosure.
TABLE-US-00001 TABLE 1 One hour representation of DW10 coking
cycle. Duration Engine speed Torque Boost air after Step (minutes)
(rpm) Load (%) (Nm) Intercooler (.degree. C.) 1 2 1750 20 62 45 2 7
3000 60 173 50 3 2 1750 20 62 45 4 7 3500 80 212 50 5 2 1750 20 62
45 6 10 4000 100 * 50 7 2 1250 10 25 43 8 7 3000 100 * 50 9 2 1250
10 25 43 10 10 2000 100 * 50 11 2 1250 10 25 43 12 7 4000 100 *
50
[0064] Various fuel additives were tested using the foregoing
engine test procedure in an ultra low sulfur diesel fuel containing
zinc neodecanoate, 2-ethylhexyl nitrate, and a fatty acid ester
friction modifier (base fuel). A "dirty-up" phase consisting of
base fuel only with no additive was initiated, followed by a
"clean-up" phase consisting of the base fuel plus additive(s). All
runs were made with 8 hour dirty-up and 8 hour clean-up unless
indicated otherwise. The percent power recovery was calculated
using the power measurement at end of the "dirty-up" phase and the
power measurement at end of the "clean-up" phase. The percent power
recovery was determined by the following formula
Percent Power recovery=(DU-CU)/DU.times.100
wherein DU is a percent power loss at the end of a dirty-up phase
without the additive, CU is the percent power loss at the end of a
clean-up phase with the fuel additive, and power is measured
according to CEC F98-08 DW10 test.
TABLE-US-00002 TABLE 2 DU % CU % Run Power Power % power No.
Additives and treat rate (ppm by weight) Change Change Recovery 1
Compound of Comparative Example 1 (120 ppm) -5.39 -5.08 6 (32 hour
dirty up and 32 hour clean up) 2 Component (a) Example 2 (25 ppm)
-3.71 -3.79 -2 3 Component (a) Example 1 (50 ppm) -5.10 -5.22 -2 4
Component (a) Example 1 (20 ppm) -4.60 -5.86 -27 5 Component (b)
Example 3 (95 ppm) -6.06 -3.06 50 6 Component (b) Example 4 (150
ppm) -4.82 -2.28 53 7 Comparative Example 1 (75 ppm) and Component
(a) -4.66 -4.08 12 Example 1 (20 ppm) 8 Mixture of Component (a)
Example 1 (20 ppm) and -3.66 1.08 130 Component (b) Example 3 (75
ppm) 9 Mixture of Component (a) Example 1 (20 ppm) and -5.68 0.95
117 Component (b) Example 3 (75 ppm) 10 Mixture of Component (a)
Example 1 (20 ppm) and -5.74 -0.54 91 Component (b) Example 3 (75
ppm) 11 Mixture of Component (a) Example 1 (20 ppm) and -5.73 -0.03
99 Component (b) Example 3 (20 ppm) 12 Mixture of Component (a)
Example 1 (50 ppm) and -4.96 1.84 137 Component (b) Example 3 (10
ppm) 13 Mixture of Component (a) Example 1 (20 ppm) and -4.08 0.15
104 Component (b) Example 4 (75 ppm) 14 Mixture of Component (a)
Example 2 (20 ppm) and -4.58 0.49 111 Component (b) Example 3 (75
ppm)
[0065] As shown by the foregoing inventive Runs 8-14, a detergent
mixture containing components (a) and (b) provides significant
improvement in power loss recovery compared to a conventional
dispersant added to the fuel as shown in Run 1 and compared to the
arithmetic sum of the individual components (a) and (b) added to
the fuel alone as shown in Runs 2-6. Each of the Runs 8-14 showed a
synergistic increase in power recovery over what would be expected
from adding the power recovery of the individual components (a) and
(b). Run 7 shows that a combination of component (a) and the
compound of Comparative Example 1 does not provide the synergistic
result obtained when component (a) is combined with component
(b).
[0066] It is noted that, as used in this specification and the
appended claims, the singular forms "a," "an," and "the," include
plural referents unless expressly and unequivocally limited to one
referent. Thus, for example, reference to "an antioxidant" includes
two or more different antioxidants. As used herein, the term
"include" and its grammatical variants are intended to be
non-limiting, such that recitation of items in a list is not to the
exclusion of other like items that can be substituted or added to
the listed items
[0067] For the purposes of this specification and appended claims,
unless otherwise indicated, all numbers expressing quantities,
percentages or proportions, and other numerical values used in the
specification and claims, are to be understood as being modified in
all instances by the term "about." Accordingly, unless indicated to
the contrary, the numerical parameters set forth in the following
specification and attached claims are approximations that can vary
depending upon the desired properties sought to be obtained by the
present disclosure. At the very least, and not as an attempt to
limit the application of the doctrine of equivalents to the scope
of the claims, each numerical parameter should at least be
construed in light of the number of reported significant digits and
by applying ordinary rounding techniques.
[0068] While particular embodiments have been described,
alternatives, modifications, variations, improvements, and
substantial equivalents that are or can be presently unforeseen can
arise to applicants or others skilled in the art. Accordingly, the
appended claims as filed and as they can be amended are intended to
embrace all such alternatives, modifications variations,
improvements, and substantial equivalents.
* * * * *